Make Dialogs more accessible

Signed-off-by: Stefan Parviainen <pafcu@iki.fi>

src/components/views/dialogs/QuestionDialog.js

@@ -66,6 +66,7 @@ export default React.createClass({
             <BaseDialog className="mx_QuestionDialog" onFinished={this.props.onFinished}
                 onEnterPressed={this.onOk}
                 title={this.props.title}
+                contentId='mx_Dialog_content'
             >
                 <div className="mx_Dialog_content">
                     { this.props.description }